how to return for loop tables to a table

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karishma koshy
karishma koshy 2019-8-15
回答： Pujitha Narra 2019-8-19
Hi All
I want to return two tables inside a for loop to the main table outside.
mat_bac is the main table outside the for loop.
Data_1 for i and data_2 for i+1 are the tables I need to return to mat_bac. So that at the end it's not overwritten.
Thank you.
I have a main table outside the for loop
frame par1 par2 par3
_____ ________ ________ ______
1 268.13 143.89 25.376
1 85.818 84.414 27.488
1 173.56 165.74 28.634
1 651.7 471.31 23.389
1 678.37 317.05 32.631
1 611.04 94.878 21.631
1 451.42 353.31 26.549
1 177.49 515.96 26.596
1 287.63 367.65 29.248
1 492.5 62.251 46.735
2 265.99 141.51 25.046
2 88.22 80.331 28.023
2 174.12 168.28 28.08
2 286.95 371.45 29.611
2 681.29 322.52 33.3
2 486.08 63.945 50.203
2 614.1 96.111 21.493
2 181.45 512.15 26.459
2 648.41 474.4 25.315
2 267.26 495.39 25.222
2 393.29 249.04 29.059
3 64.80742 146.0646 27.3122
3 290.8602 167.7889 35.7585
3 477.655 89.51805 21.64952
3 344.113 44.36785 44.03939
3 621.3208 408.272 24.24406
3 310.5134 329.8202 21.51631
3 72.62675 113.7154 23.65932
3 520.6362 404.6039 22.32997
4 289.5507 168.0988 35.5876
4 476.9346 91.47729 20.63287
4 656.3892 334.381 27.20086
4 65.7696 141.7556 27.21767
4 294.9997 330.3788 37.8143
4 549.6827 59.24164 22.09339
4 327.6798 52.62152 24.81
4 225.9563 516.5291 26.54855
4 264.0543 284.7716 36.37305
4 133.1544 124.9854 34.36764
Inside for loop i=1:4
for each iteration eg: i=1
data1
frame par1 par2 par3 par4
_____ ________ ________ ______ __
1 268.13 143.89 25.376 1
1 85.818 84.414 27.488 2
1 173.56 165.74 28.634 3
1 651.7 471.31 23.389 4
1 678.37 317.05 32.631 5
1 611.04 94.878 21.631 6
1 451.42 353.31 26.549 7
1 177.49 515.96 26.596 8
1 287.63 367.65 29.248 9
1 492.5 62.251 46.735 10
data2
frame par1 par2 par3 par4
_____ ________ ________ ______ __
2 265.99 141.51 25.046 1
2 88.22 80.331 28.023 2
2 174.12 168.28 28.08 3
2 286.95 371.45 29.611 9
2 681.29 322.52 33.3 5
2 486.08 63.945 50.203 10
2 614.1 96.111 21.493 6
2 181.45 512.15 26.459 8
2 648.41 474.4 25.315 4
2 267.26 495.39 25.222 11
2 393.29 249.04 29.059 12
now for i=1 i want to return data1 and dat2 to mat_bac, so that mat_bac has par4 included in it. likewise for i=2 ,3 ,4. my original table is much bigger than the mat_bac.
How can i do this?
Thank you
  7 个评论
显示 5更早的评论
karishma koshy
karishma koshy 2019-8-16
Yes i have gone through join(). that is not what i want.
for every iteration i want to sent the values of data1 and data2 to mat_bac with the exra column(par4), so its not overwritten. Right now, i get only the last iteration value result.
Bob Thompson
Bob Thompson 2019-8-16
'Not sure what data1 and data2 are but a table has to be regular in every variable must have the same number of rows.'
You cannot replace portions of mat_bac with data1 or data2 because of the comment above by dpb. Before you can even consider making these replacements you need to add the fifth variable to mat_bac for ALL rows. I would suggest doing this by creating a variable of the appropriate size and then something like the following:
mat_bac = addvars(mat_bac,var4,'After','var3');
If you would like other ways to add variables to tables see this.
After the fifth column has been added the replacement of values should be relatively simple, just a matter of indexing.
'Right now, i get only the last iteration value result.'
This sounds like a very different issue, likely something due to indexing. We would need to see the related part of your code to give you a more specific idea of how to fix it.

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回答（1 个）

Pujitha Narra
Pujitha Narra 2019-8-19
Hi Karishma,
You can extract the “par4” data from “data1” and “data2” and store it as a matrix. Further use this matrix to add the variable “par4” to the table “mat_bac”.
Extracting data as a matrix:
%initialization
par4=[];
%inside the loop
par4=[par4; data1.par4];
par4=[par4; data2.par4];
Adding the new variable to “mat_bac”:
mat_bac=addvars(mat_bac,par4);
You can look at these links for further information:
https://in.mathworks.com/help/matlab/matlab_prog/access-data-in-a-table.html
https://in.mathworks.com/help/matlab/matlab_prog/add-and-delete-table-variables.html

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